Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash flows from or used in operating activities
Net income	$ 446	$ 424	$ 370
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	430	384	377
Deferred income taxes and investment tax credits	28	54	15
Allowance for equity funds used during construction	(45)	(30)	(11)
Deferred recovery clauses	(58)	(40)	63
Receivables, less allowance for credit losses	(32)	(10)	52
Inventories	(8)	7	6
Taxes accrued	(13)	23	1
Accounts payable	53	34	(4)
Regulatory assets and liabilities	(10)	(18)	1
Other	6	1	(29)
Cash flows from operating activities	797	829	841
Cash flows from or used in investing activities
Capital expenditures	(1,397)	(1,361)	(1,283)
Net proceeds from sale of assets	0	6	0
Cash flows used in investing activities	(1,397)	(1,355)	(1,283)
Cash flows from or used in financing activities
Equity contributions from Parent	580	505	395
Proceeds from long-term debt issuance	790	0	292
Repayment of long-term debt	(279)	0	0
Net change in short-term debt (maturities of 90 days or less)	(230)	127	127
Proceeds from other short-term debt (maturities over 90 days)	500	300	0
Repayment of other short-term debt (maturities over 90 days)	(300)	0	0
Dividends to Parent	(450)	(408)	(373)
Other financing activities	(3)	(2)	0
Cash flows from financing activities	608	522	441
Net increase (decrease) in cash and cash equivalents	8	(4)	(1)
Cash and cash equivalents at beginning of the year	10	14	15
Cash and cash equivalents at end of the year	18	10	14
Supplemental disclosure of cash paid (received):
Interest	120	126	134
Income taxes	62	14	63
Supplemental disclosure of non-cash activities
Change in accrued capital expenditures	$ 25	$ 1	$ 17